1.                Standard of materials: GB/T3077-1999

2.                The grade of materials: 45#, 20Cr, 40Cr , 35Cr Mo , 42Cr Mo, 20CrMnMo, 20CrMnTi, 17CrNiMo6, 20CrNi2Mo

3.                Standard of pruduction: ISO1328-1995

4.                Smelting method: electric arc furnace + refining furnace

5.                Precision accuracy: according to GB/T10095-88 standard, within five degrade

6.                Hardness: 56-60 HRC is the hardest; 40-55 HRC is the average hardness; below 28 HRC is the soft

7.                Detection methods and the implementation of standards